From 4ace87cce3861b01cfb6629a11d68b85e0fdb402 Mon Sep 17 00:00:00 2001
From: "Alfred E. Heggestad" <alfred.heggestad@gmail.com>
Date: Wed, 11 Jan 2023 12:02:03 +0100
Subject: [PATCH] dtls: add logging of DTLS packet content-type

---
 src/tls/openssl/tls_udp.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/src/tls/openssl/tls_udp.c b/src/tls/openssl/tls_udp.c
index fadb068b3..aab4a1ada 100644
--- a/src/tls/openssl/tls_udp.c
+++ b/src/tls/openssl/tls_udp.c
@@ -34,6 +34,15 @@ enum {
 };
 
 
+/* TLS ContentType defined in RFC 5246 */
+enum content_type {
+       TYPE_CHANGE_CIPHER_SPEC = 20,
+       TYPE_ALERT              = 21,
+       TYPE_HANDSHAKE          = 22,
+       TYPE_APPLICATION_DATA   = 23
+};
+
+
 struct dtls_sock {
 	struct sa peer;
 	struct udp_helper *uh;
@@ -66,6 +75,21 @@ struct tls_conn {
 };
 
 
+#if DEBUG_LEVEL >= 6
+static const char *content_type_str(enum content_type content_type)
+{
+	switch (content_type) {
+
+	case TYPE_CHANGE_CIPHER_SPEC: return "CHANGE_CIPHER_SPEC";
+	case TYPE_ALERT:              return "ALERT";
+	case TYPE_HANDSHAKE:          return "HANDSHAKE";
+	case TYPE_APPLICATION_DATA:   return "APPLICATION_DATA";
+	default: return "???";
+	}
+}
+#endif
+
+
 static int bio_create(BIO *b)
 {
 	BIO_set_init(b, 1);
@@ -702,6 +726,8 @@ static bool recv_handler(struct sa *src, struct mbuf *mb, void *arg)
 	if (b < 20 || b > 63)
 		return false;
 
+	DEBUG_INFO("receive '%s' from %J\n", content_type_str(b), src);
+
 	tc = conn_lookup(sock, src);
 	if (tc) {
 		conn_recv(tc, mb);